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Q: Can you explain in detail the specified input voltage, input frequency and max. undamaged input voltage at different voltage range?
A:

Yes, please see below table referred to SM2130 and SM2160.

ModelRangeInput VoltageInput FrequencyMax Undamaged Input Voltage
   SM21303mV30mV300mV ≤300mV5Hz-1kHz350Vrms
1kHz-10kHz35Vrms
10kHz-3MHz10Vrms
3V30V0.3V-7V5Hz-3MHz350Vrms
30V300V7V-300V5Hz-100kHz350Vrms
300V300V-400V45Hz-10kHz400Vrms

   SM21603mV30mV300mV ≤300mV5Hz-1kHz350Vrms
1kHz-10kHz35Vrms
10kHz-6MHz10Vrms
3V30V0.3V-7V5Hz-6MHz350Vrms
30V300V7V-300V5Hz-100kHz350Vrms



Q: What's the best resolution of SM2160?
A:

It’s 0.1uV at 3mV range.

Q: What is the maximum frequency of the Suin SM2160? How many channels does it have?
A:

The Suin SM2160 is a 6 MHz, dual channel AC digital millivolt meter.